EP3676424A1

EP3676424A1 - Connecting element for electrically and mechanically connecting two electrolytic cell stacks, and electrolysis device

Info

Publication number: EP3676424A1
Application number: EP18810941.7A
Authority: EP
Inventors: Erik Wolf
Original assignee: Siemens AG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2017-11-24
Filing date: 2018-11-19
Publication date: 2020-07-08
Anticipated expiration: 2038-11-19
Also published as: US20210175533A1; US11258090B2; CA3083312A1; EP3676424B1; CA3083312C; EP3489393A1; WO2019101681A1

Abstract

The invention relates to a connecting element (2, 7, 8, 41) for electrically and mechanically connecting two electrolytic cell stacks (3, 4, 5). The invention further relates to an electrolysis device (1, 40), comprising at least one connecting element (2, 7, 8, 41) of this type and the electrolytic cell stacks (3, 4, 5) connected by means of said connecting element. For the hydraulic connection of the electrolytic cell stacks (3, 4, 5), the connecting element (2, 7, 8, 41) has at least two hydraulic interfaces (14, 28, 29, 31, 33, 36, 37) for each of two water circuits, which water circuits are independent of each other. Furthermore, the connecting element (2, 7, 8, 41) has electrical connection points (10) electrically connected to each other, in order to connect the electrolytic cell stacks (3, 4, 5) in a common circuit. By means of the connecting element (2, 7, 8, 41), the connected electrolytic cell stacks (3, 4, 5) can be hydraulically separated or connected to each other, depending on the design.

Description

description

Connecting element for the electrical and mechanical connec the two electrolytic cell stack and electrolysis device

The invention relates to a connecting element for electrical and mechanical mechanical connection of two electrolytic Sta pel and an electrolysis device with such a connecting element.

Electrolysis is a process widely used nowadays in various fields, in which, for example, an electric current splits up water for the production of hydrogen and oxygen. The electrolysis usually takes place in electrolysis cells, with several electrolysis cells can be combined to form a module. A plurality of electrolysis cells or a plurality of modules can be combined into a so-called electrolysis cell stack (English "stack").

Electrolysis cells are low-voltage high-current consumers. A typical voltage level of a single electrolysis cell or a typical voltage drop across a single electrolysis cell in operation may typically be in the range of 1.8 V _DC to 2.6 V _DC , so be for example 2V _DC . In operation, that is to say in the case of electrolysis, an actual power requirement with an active area of the respective electrolysis cell scales, the power requirement for example being 1 to 2 amperes per square centimeter (A / cm ² ). Today, electrolysis cells with an active area of more than 1000 cm ^{2 are} available and, in the future, electrolytic cells with an active area of approximately

10,000 cm ² planned. Thus, the power requirement for such electrolysis cells can reach some 10,000 A. Elektrolysezel len or corresponding electrolysis or - devices are often operated with DC voltage, which is generated from rectified AC voltage. For this purpose, rectifiers are often used, which are considered functional Use components power semiconductors whose specific costs are usually dominated by their current carrying capacity. The key figure for a rectifier is in egg ner use for electrolysis so the respective price per ampere DC. A typical voltage range or a typical location corresponding voltage rectifier can be with play 1200-1500 V _D c.

In principle, it would therefore be advantageous to switch many electrolysis cells electrically in series, since in this way the maximum possible voltage position of the respective upstream rectifier is utilized and thus the efficiency of the respective electrolyzer, ie the respective electrolysis device, can be improved or optimized. For practical applications, however, a reasonably achievable buildable length of a single electrolytic cell stack is mechanically limited. Thus, it is not possible for any number of individual but only one number of individual electrolysis cells in an electrolytic cell stack, which is predetermined by the manageable mechanical stability of the electrolysis cell stack, to be grouped together. With a larger overall length, so a RESIZE ßeren number of combined electrolysis cells, it may lead to a rupture of the electrolysis cells or buckling of the electrolysis cell stack, comparable bar to the Euler kinks. This problem occurs because the individual electrolysis cells of an electrolytic cell stack are mechanically clamped together, in the stacking direction, ie in the direction or along a parallel to the main parallel planes of the individual electrolysis cells vertically extending stack axis, depending on a pressure-area ratio pressure loads in the Size order of some 10 t occur or can be used. Another, the number of in a Elektro lysezellenstapel in series switchable or

Anordenbarer electrolytic cells limiting problem lies in the manufacturing tolerances, for example, respective frame of the individual electrolysis cells. The achievable for the appropriate frame thicknesses with reasonable effort tolerances By adding the plurality of electrolytic cells in the electrolytic cell stack, they can add up in a tuple chain. Thus, from a certain number of electrolysis cells, total values or deviations can be achieved which can no longer be tolerated.

In today's electrolysis systems, the structural-mechanical limitation of the length of the electrolysis cell stack relationship, the corresponding number of summarized Elek rolysis cells and the associated non-optimal use of the voltage provided by conventional rectifiers voltage with the concomitant relatively low Effizi enz as well as the also associated additional component and cost simply accepted.

Object of the present invention is to enable a comparison with conventional electrolysis plants more efficient Elektrolysebe operation.

This object is achieved by the subject matters of the independent claims. Advantageous Ausgestal lines and developments of the invention are specified in the dependent claims and in the description and in the drawings.

An inventive connecting element is used for electrical rule and mechanical connection of two electrolysis cell Sta pel. The connecting element has a rigid base body, which in turn for hydraulic connection of at least one of the electrolysis cell stack for a first water circuit has a first inlet and a first outlet and a second inlet and a second outlet independent of the first water cycle second water cycle. The connecting element therefore has at least four hydraulic connections or interfaces for a total of at least two separate water circuits in the form of runs and operations. For example, the one water Circuit for recovering hydrogen gas and the other What circuit serve to recover oxygen gas. By separating the water cycles can then advantageously a se parate water supply with each adapted promotion o- adapted inflow and outflow and / or adapted conditioning or conditioning Kon be realized.

The connecting element also has electrically connected with each other connected electrical connections for electrical connection to the two electrolytic cell stack. The connec tion element forms an electrical connec tion of the two electrolytic cell stacks connected to the electrical connections connected electrolysis cell stacks in a common circuit. Depending on the design and needs can be provided for connecting each of an electrolytic cell stack, an electrical connection or an electrical connection or it can be provided per electrolytic cell stack several electrical connections or connections. In any case, by the connecting element to this connected Elek rolysezellenstapel be electrically connected or coupled to each other.

Furthermore, the connecting element mechanical connec tion interfaces for mechanically connecting the electrolyte sezellenstapel with the connecting element. The mechanical connection interfaces are arranged on each other against opposite sides of the connecting element, so that when mechanically verbun with the connection interfaces which electrolytic cell stacks whose stack axes paral lel each other extend. The mechanical connection interfaces can preferably be arranged such that the stack axes of connected electrolysis cell stacks extend or arrange coaxially, ie, collapse. Likewise, however, a staggered arrangement may be provided in which the electrolytic cell stacks are still arranged on opposite sides of the Verbindungselemen tes, but their stacking axes really paral lel, so offset from each other. Independent of concrete configuration can be achieved by the parallel alignment of the stacking axes a space-saving, particularly simple space efficient with other similar arrangements stackable construction. The mechanical connection sections serve to mechanically couple the electrolytic cell stack to the connecting element, so that a composite or an assembly of the connecting element and the electrolytic cell stack (s) connected to it, ie an electrolysis device, can be produced.

The mechanical connection interfaces can preferably be designed for producing a reversible mechanical connection or coupling of the electrolysis cell stacks. Here by advantageously a modular, flexible structure of an electrolysis or electrolysis plant realized who the. Likewise - for example, for repair - before geous a replacement of an electrolytic cell stack and / or the connecting element can be facilitated. The mecha African connection interfaces can be formed in various Ar th and ways, for example as a plug-in, latching or screw connection or -aufnahme, as a flange or flange connection or the like. It may also be possible to combine the mechanical connection sections with the electrical connections, ie to combine them in an electrically-mechanical interface or an electrically-mechanical connection. It can be arranged on each of the opposite sides of the connecting element, which are provided for arranging an electrolytic cell stack, each one or more such kombi ned electrical-mechanical connections or interfaces. A combined electrical-mechanical interface can advantageously facilitate the connection of electrolysis cell stacking with the connecting element, since we niger separate interfaces must be correctly aligned with each other. It can be particularly advantageous to arrange a plurality of mechanical connection interfaces on each of the two sides in order to achieve a stable, reliable connection between the electrolysis cell stacks and the connection element. ment, and thereby form each side only one of these connection interfaces as a combined electrical mechanical connection or interface. Hereby can be advantageously reduced complexity and a component and cost.

The connecting element according to the invention makes it possible, in some cases, to electrically connect at least two electrolytic cell stacks with one another, in particular to connect or arrange them electrically in series. As a result, advantageously provided by a to operate the electrolytic cell stack before seen rectifier voltage relationship as voltage situation can be exploited, since

electrically effectively a larger number of Elektrolysezel len, in particular serially, connected together relationship, can be interconnected as in a single electro lysezellenstapel are arranged or can be arranged. The connecting element thus makes it advantageously possible to adapt the voltage level of a resulting overall group or composite, ie an electrolysis device, by interconnecting or connecting electrolytic cells or modules in such a way that it optimally matches that voltage level of a power supply, that is to say the rectifier. This can improve the efficiency of an electrolysis device or electrolysis system comprising a plurality of electrolytic cell stacks, in particular with regard to reduced cost, component and maintenance costs, as well as with regard to electrical energy efficiency.

This contributes in addition to the improved utilization of the voltage position or voltage level also that a less aufwändi ge power supply, so for example less rectifier ter, are needed, which reduces energy losses who can. These effects can be realized particularly advantageously by the use of the connecting element, without the length of the individual electrolytic cell stacks or the number of electrolysis cells installed in each case. len, that is, without the mechanical sta tion of the electrolytic cell stack to reduce or dangerous.

In contrast to previous electrolysis systems in which meh rere electrolysis cell stack independently angeord net and operated by the connecting element of the invention particularly easy, platzspa rend and sure a defined and solid spatial Ausrich tion of the electrolytic cell stack can be achieved to each other, which is a collection or collection of generated gas, as example of hydrogen and oxygen produced can simplify. In particular, it is particularly easy, for example, to generate hydrogen gas produced in both or all of the electrolytic cell stacks in a common first collection or collection system and oxygen gas generated in either or all of the electrolytic cell stators in a common second collection or collection system. In addition, since a separate electrical energy supply of each electrolysis cell stack can be omitted, can be reduced by the inven tion proper connection element a total of egg ner electrolysis device or system with multiple electro lysezellenstapeln and thus their handling speed can be improved.

In addition, the connecting element can advantageously provide a central, secure access point to an electrical system of all closed electrolysis cell stacks. Especially before geous is that when interacting with this access to, for example, to connect an external power supply, not with the under mechanical tension are the electrolysis cell stacks itself must be interacted. By connecting element can thus cell stack in a particularly simple manner a risk of damage to the electrolysis, for example, a risk to cause a leak to be reduced as well as the risk of injury each operating or maintenance personnel. Another advantage of the invention Verbindungsele element is that a number of external electrical rule and / or hydraulic interfaces, which are required to Be drove Be several electrolysis cell stack be made available be reduced or who can, since in the connecting element a bundled access to the corresponding electrical and / or hydraulic systems of the connected electrolytic cell stack can be reali Siert.

A further advantage of the present invention lies in the scalability of electrolysis systems made possible by this. Such scaling is made possible with very little effort since simplified, standardized and uniform electrolytic cell stacks can be flexibly and modularly coupled to one another in any desired number Connection or connection costs, so an infrastructure costs, compared to the usual conventional conven tional approach can be reduced. It may be possible for example, by the use of multiple Ver connecting elements more than two electrolytic cell stack seri ell to each other or together

electrically connect. For example, from a changing arrangement of electrolytic cell stacks and connec tion elements may be provided. This results in the sequence of electrolysis cell stack, connecting element, Elektrolysezel lenstapel, connecting element, electrolysis cell stack, etc.

Likewise, a scaling in the transverse direction may be possible, in which, for example, two or more electrolytic cell stack ne adjacent to each other at the opposite sides of the connecting element connected to this relationship, can be connected to this. Thus, a special space-efficient arrangement and / or a combination of a series and a parallel circuit of Elektrolysezel lenstapeln on the common connection element can be realized. Again, such an arrangement over egg ner individual handling and contacting individual Electrolysis cell stack can be simplified, since the corre sponding electrical and / or hydraulic interconnections or connections can already be reali Siert in the connecting element, so that for producing the desired order or interconnection only the electrolyte sezellenstapel connected to the connecting element and not individually contacted.

Especially for electrolysis systems in which a variety of electrolytic cell stacks is operated, the connec tion element or the respective connec tion elements can also be used to compensate for tolerances zen advantageous. For this purpose, the connecting element in example, a damping or a flexible element, for example, at least one of the opposite, for connecting the electrolytic cell stack vorgese Henen pages, arranged rubber sleeve or the like. This can advantageously a tolerance compensation he possible without reducing a mechanical stability of the individual electrolytic cell stacks and / or increase their manufac turing effort. Additionally or alternatively, the hydraulic interfaces, ie the inlets and Abläu fe, designed as flexible hose elements or be ver on the side of the connecting element with flexible hose elements. These hose elements can be movably attached to the main body of the connecting element. The main body may have respective recesses or pockets for receiving the hose elements. The cunning chelemente can be connected at their respective end facing the base body with rigid, run in the body or running pipes.

In the context of the present invention or in the present specification, the water mentioned several times is representative of any electrolysis fluid to ver and also corresponding water pipes, water circuit runs, hydraulic connections and the like are not limited to the passage or use of water. The Ver- Used terms "hydraulics" and "hydraulic" and their variants each give the reference to a corresponding fluid system of the present invention or a corresponding use and do not relate to facilities for hydraulic power transmission, hydraulic cal transmission or the like. A hydraulic interface is in this sense, for example, a Rohrlei connection port through the water flow or gelei can be switched. The hydraulic system of the Verbindungsele management or realized using the connecting element system or arrangement may accordingly in example their hydraulic interfaces, Wasseran connections, water pipes, pipelines, reservoirs and the like include.

Furthermore, the feeds and drains mentioned herein may collectively be referred to as hydraulic interfaces. By a usually possible reversal of the respective direction of flow, an inlet can become a drain and vice versa. Such reversal may be possible for one or both water cycles independently. Accordingly, a hydraulic interface which has been heretofore and hereinafter referred to as an inlet can also function as a drain, and a hydraulic interface designated as a drain can act as an inlet.

In an advantageous embodiment of the present invention, the connecting element for each water cycle we least one connected to this by a pipe external hydraulic connection for connecting an external, different from the electrolysis cell stacks water pipe.

For permanent operation of the electrolysis, the corresponding fluid, here for example the water, usually has to be regularly or continuously fed from an external source and removed from the electrolysis cell stacks. This can be advantageous over the external connections, ie the external connections of the connecting element, take place, via which an exchange of water between the Ver connecting element, in particular a piping system or hydraulic system of the connecting element, and an external source or environment is feasible. It can thus gelei in example of the respective external source or via the external water pipe through or via an external connection in the connecting element or in the hydraulic or piping system of the connecting element and Gelan gelan in one of the water circuits.

Following this route, the water can then be passed through an outlet of the connecting element into a connected electrolysis cell stack. After the water has passed through the electro lysezellenstapel, it can get over an inlet of the connecting element back into this. Subsequently ßend the water can be dissipated via a further external connection in an external water pipe, for example, to be re-supplied to a treatment or disposal and / or the electrolyte sezellenstapel. Without the relationship between the external connections of the connecting element, the water or the respective electrolyzing fluid could, for example, be supplied to the electrolysis cell for permanent operation via a corresponding connection or a corresponding hydraulic interface of the respective electrolytic cell stack. By virtue of the configuration of the connecting element described here, the water supply or water supply of the electrolytic cell stacks can thus advantageously be arranged on the connecting element centrally or thus particularly easily accessible and safely, ie with little risk, or realized via the connecting element.

The respective external connection can thereby be identical to one of the inlets and / or outlets, that is to say with one of the inlets and / or outlets of the respective watercourse. Beispielswei- The first inlet can be an external connection, that is, it can be designed as an external connection. Additionally or alternatively, for example, the second sequence may be such an external connection.

Likewise, however, may be provided for each one or both water circuits depending Weil least in addition to the respective inlet and drain least an external connection. For example, such an additional external connection can be provided for each inlet and outlet, via which a hydraulic contact or a hydraulic connection between this electrolytic cell stack and the connecting element is produced when connecting an electrolytic cell stack. In other words, then serve the inlets and outflows of the connecting element as a transition for a fluid, in particular the water used for the electrolysis, bonding between the United and the respective electrolytic cell stack, while the external connections a respective hydraulic interface to an external, so both from the verbin forming element as well as the electrolytic cell stacks ver different, hydraulic system or conduit system.

In an advantageous embodiment of the present invention, the connecting element is designed as an end element or end cap for a first of the two electrolytic cell stacks. The electrolytic cell stack associated with this electrical connections and mechanical connection interfaces are there for the direct connection or connecting this electrolytic cell stack with the connecting element ausgebil det. The second of the two electrolytic cell stack associated electrical connections and mechanical connec tion interfaces are connected to connect or Ver with a serving as an end element or end cap of the second electrolytic cell stack, structurally identical connection element.

In the case of electrolysis cell stacks connected or coupled to one another by the connecting element, in other words So only one of the two electrolytic cell stack di rectly connected to the connecting element, while the other electrolytic cell stack indirectly, ie indirectly via another, identical connection element indirectly connected to demje nigen connecting element or is coupled to which the aforementioned electrolytic cell stack is connected directly, ie directly. In a derar term arrangement results along the pile axes tet viewing therefore tet the sequence of electrolysis cell stack, Verbindungsele element, connecting element, electrolytic cell stack. A derar tiger composite can therefore have a mirror or plane of symmetry, which I extend perpendicular to the stacking axes between the two connecting elements or in their con tact surface or contact plane. The two electrolytic sezellenstapel are thus also electrically and mechanically interconnected with each other, wherein the two Verbindungsele elements together as a two-part connector can be summarized.

An advantage of such a split, modular design can be that each electrolytic cell stack can be routinely equipped with a connecting element as an end element or end cap, so can be completed. From such allies from a respective electrolysis cell stack and egg nem arranged thereon connecting element can then be built a large or more complex electrolysis flexible and modular with simplified logistics, since no separa te installation of electrolysis cell stacks and connecting elements on site is necessary, but only the same end pieces the networks must be coupled. In addition, by arranging such a connection element as an end element or end piece on an electrolytic cell stack, this can be advantageous, for example, during a

Transport or installation process from damage.

In a particularly advantageous embodiment of the invention, the inlets and outlets, so the hydraulic cutting provide, the first and the second water cycle ers th electrolytic cell stack associated with, so that the connec tion element in pellos connected to this electrolytic cell only of water of the first electrolytic cell stack can be flowed through and thereby forms a hydraulic separation between tween the electrolysis cell stacks. In other words, therefore, the inlets and outlets of both water circuits for supplying or discharging water to bezie relation to serve as from the first stack of electrolysis cells. Neither the first nor the second water cycle are therefore in hy lic connection with the second electrolytic cell stack or its water circuits. Due to the hydraulic system of the connecting element so no hydraulic, ie water-conducting or water-conducting connection between the respec conditions hydraulic systems of connected to the connecting element electrolytic cell stack is produced even when two electrolysis cell stacks NEN connected.

The two inlets and outlets of the two water circuits can be vorgese hen as hydraulic interfaces between the connec tion element and the first electrolysis cell stack. For this purpose, preferably the inlets and outlets in the water circuits can be arranged on a single side of the connecting element to allow the simplest hydrau lic connection of the electrolytic cell stack with the Ver connecting element. At least one Externan circuit can of course also be provided in this embodiment form. Likewise, for example, the first inlet or outlet and the second inlet or outlet can be designed as external connections.

By means of a cell as a hydraulic separation or as hy-separating element between it connected to electrolysis cell stacking connecting element so it is possible, please include to connect several electrolytic cell stack electrically and mechanically with each other but at the same time to separate hydraulically. This can be particularly advantageous use or allow application of the present invention in a self-challenging electrolyzer.

In a self-challenging electrolyser, so in the self-promoting electrolysis, for example, by the water splitting process resulting gas stream is used to suck or Nachfördern of more for the process, so the continuous, continuous electrolysis, needed water. The electrolysis inherent gas generating process thus drives the respective water cycle, that is, the suction or Nachfördern and the corresponding discharge or discharging the water independently, without a pump is needed.

However, the use of self-challenging electrolysis is possible only for a relatively limited number of electrolysis cells connected in series, this number of electrolytic cells is in particular smaller than the number of electrolysis cells stacked in the two connected by means of the connecting element electro electrolysis cells.

An electrolytic cell stack can, for example, have 250 electrolysis cells, which can be organized or arranged in five modules of 50 electrolysis cells, for example. The self-challenging electrolysis can be successfully used in the current state of the art, for example, for 2 to 100 hydraulically connected in series electrolysis cells. This is attributed to ren that technically induced asymmetries in a flow field of the water flow or the water cycle between the cells as well as increasing with increasing number of electrolysis cells flow resistance, in particular in the intake, to technical problems. This can be, for example, a lack of water, a local overheating due to high current densities or a local cooling down to below a minimum efficient operating temperature. For these reasons, electrolysis cell stacks or modules with a relatively small, for the self-demanding electrolysis so far known electrolysers suitable number of electrolysis cells used to avoid ent speaking critical conditions. This goes hand in hand with the need for a separate power supply and equipment with hydraulic interfaces. This in turn leads so far to a high technical and financial wall and low efficiency, since due to the low number of electrolysis cells and a total voltage drop across all electrolysis cells away can not be satisfactorily adapted to a voltage level provided to the electrical supply voltage. If, for example, 50 electrolysis cells are combined with a voltage drop of 2 V each, the result is only a voltage level of approximately 100 V over the entire interconnect, which is far from exploiting the voltage level of, for example, 1500 V which can be provided by the electrical supply is. The present invention allows by the electrical, serial connection of the electrolysis cells with simultaneous hydraulic separation so advantageous to apply the self-challenging electrolysis and at the same time to achieve improved electrical efficiency through improved utilization of the voltage provided by the electrical supply. In particular, this is made possible in a compact, particularly easy-to-use electrolysis device.

If an electrolytic cell stack comprises more electrolysis cells than can be serially coupled for a self-challenging electrolysis, two separate hydraulic systems, each with two independent water circuits, can be provided for this electrolysis cell stack, for example. Dement speaking, for example, at least two hydraulic interfaces of the connecting element may be assigned to a first of the hydraulic systems and at least two further hydrau lic interfaces of the connecting element a second of the two hydraulic systems.

In a further advantageous embodiment of the present invention, the connecting element additionally has a third Inlet and a third sequence, ie a third set of two hydraulic interfaces, for a third water circuit and a fourth inlet and a fourth outlet, so a fourth set of two hydraulic interface Stel len, for a fourth water cycle, with all four water circuits from each other independent, so are separated. In other words, four water circuits are thus hen vorgese, each of which has an inlet and a drain, or two hydraulic interfaces, which are each connected to each other by means of a respective pipe.

Here and in the sense of other embodiments of the inventions to the invention connecting element, it is not vorgese hen that the respective water cycle completely as tat neuter closed circuit is part of the Verbindungselemen tes itself. It is merely to be expressed here that according to the invention, the connecting element has several separately through the respective hydraulic interfaces to common pipe sections, ie parts of hy metallic system, which are not connected hydraulically miteinan and therefore separated as sections or sections, so independent from each other Water circuits are used, or are used in connected electrolysis cell stacks.

The hydraulic interfaces, ie the inlets and Abläu fe, for the first water cycle and the second What serkreislauf are assigned to a first of the two electrolysis cell stack and the hydraulic interfaces, ie the inlets and outlets for the third water cycle and for the fourth water cycle are assigned to a second of the two electrolytic cell stacks. Such an assignment means that, as intended, the respective electrolytic cell stack is connected to the hydraulic interfaces assigned to it, so that when the electrolytic cell stack is connected, a corresponding water cycle of this electrolysis cell stack with the corresponding, added arranged water circuit of the connecting element is hydraulically connected.

Thus, the connecting element is at the same time of water in both connected to this electrolysis cell stacks

Flowed through electrolysis cell stack and forms a hydraulic separation between the electrolysis cell stacks. In other words, the connecting element in this case therefore has at least eight hydraulic interfaces, four of which are assigned to the one electrolysis cell stack and / or connected to it and the remaining four are assigned to the other electrolysis cell stack and / or connected to it. Illustratively, this can be understood as combi nation or union of two herein described elsewhere, each described as an end element or end cap for an electrolytic cell stack fasteners with four hydraulic interfaces who the.

Depending on the specific application, by such a monolithic connecting element with at least eight hy lic interfaces, which thus has all hydraulic, electrical and mechanical connections, connections and interfaces for connecting at least two electrolytic sezellenstapeln, such as replacement of an electrolytic cell stack, such as for repair purposes, club be facht. This may be the case since, for example, no separate connecting element is required for the respective new electrolysis cell stack or has to be removed from the electrolysis cell stack to be replaced. Due to the mono-lithic design of the connecting element, moreover, the number of connections or interfaces between separate components can be reduced, which can lead to reduced susceptibility to leaks.

In a further advantageous embodiment of the present invention, the connecting element for the two water circuits piping, which the respective inlet with the respective sequence - ie the respective hydraulic interfaces with each other - connect, so that when connected electrolysis cell stacks, the connecting element thereby stack a hydraulic connection of the electrolysis cells, or of their water cycles, forms or manufactures. The pipes can therefore completely reach through the Verbindungsele element, for example, from one of the two opposite sides to the other.

Thus, for example, the connecting element can have two inlets or an inlet and a drain for the hydraulic connection of one, ie the first electrolysis cell stack, on one side. On the other hand, the connec tion element can then accordingly two processes or an expiration and an inlet for the hydraulic connection of the walls ren, ie the second electrolytic cell stack have. For example, therefore, the water of the first water cycle run, which passes from the first electrolysis cell stack through the first inlet into the connecting element through the adjoining pipe through the first flow from the connecting element in the second electrolytic cell stack flow. The same can apply, if appropriate also with the direction of flow reversed, for the water flowing through the connecting elements to flow through the second inlet and the second outlet between the two electrolytic cells of the second water circulation.

The connecting element in the design described here from so both the electrical and mechanical connection Ver as well as the hydraulic connection of the two

Electrolysis cell stack or her. By means of the connec tion element, in particular a plurality of electrolysis cell stack can be electrically and hydraulically connected in series, which advantageously the efficiency of a suitably built-up electrolysis plant can be increased while reducing costs and component costs. Thus, it is possible to effectively define the structural-mechanical limitations described elsewhere which determine the maximum length or overall length, ie the number of electrolysis cells of an electrolytic cell stack. to be bypassed. Thus, therefore, the maximum possible voltage level of an upstream equal judge stacked by serial interconnection of electrolysis cells can be electrically exploited, that is, an optimal voltage matching regardless of the structural limitations of an individual electrolytic cell stack can be achieved. By connecting the electrolytic cell stack hydraulically by means of the connecting element, a continuous water cycle can be realized over several electrolysis cell stacks, whereby advantageously a number of external hydraulic interfaces for connection to an external water supply or an external hydraulic system can be mini mized. This is advantageous as well as a mini mization of complexity and installation costs of the entire electrolysis associated.

In a further development of the present invention, the connecting element can additionally provide further hydraulic cut. These may be, for example, a first white inlet, a first further outlet, a second additional inlet and a second further outlet. In this case, each of the thus at least four feeds can be connected to exactly one of the thus at least four processes by a respective Rohrlei device. Here, too, this Rohrleitun conditions pass through the connecting element so that when connected to the Ver connecting element electrolytic cell stacks, the connecting element forms a hydraulic connection of the water circuits of the first electrolysis cell stack with the ent speaking water cycles of the second electrolytic cell stack or manufactures. In other words, in other words, the connecting element can have two inlets and two outlets for the hydraulic connection of the first electrolytic cell stack, for example on one side. On the walls ren, for example, on the opposite side, the connecting element can accordingly have two processes and two inlets for hydraulically connecting or connecting the second electrolytic cell stack. With such an arrangement, for example, for both electrolytic cell pel each return flow through the Elektrolysezel lenstapel be made possible for both independent water cycles. This can be advantageous, for example, if a respective central external inflow and outflow, ie the connection to an external hydraulic system, is arranged on the connecting element. At the respective, remote from the connecting element ends of the Elektrolysezel lenstapel then advantageously no hydraulic interface must be provided, whereby a particularly simple space-saving installation can be made possible. Likewise, such a configuration of the connecting element, for example, for connecting two electrolysis cell stacking be used on each side, each of these, then four, electrolytic cell stacks by two hydraulic interfaces - for example, one to run and one drain or two similar hydraulic interfaces if the electrolytic cell stacks are flowed through in one direction only with respect to the connecting element - can be hydraulically connected to the connecting element. Thus, a particularly compact Elektrolyseanla ge can be realized.

The connecting element according to the invention can in all Ausfüh tion forms as hydraulic interfaces each having only the hydraulic interface Stel mentioned or described here len. Likewise, the connection element according to the invention, however, each have further hydraulic interfaces, for example, if it serves as a node of, in a more complex, hydraulic system. Thus, for example, a passage of water to another connecting element or a further electrolysis cell pel on or in the connecting element according to the invention is arranged or realized.

In an advantageous development of the present inven tion, the inlets, the processes - ie the hydraulic interfaces - and the pipes pressure-bearing, so as pressure-bearing components formed. In particular, they are designed to withstand an internal pressure of at least 35 bar. For this purpose, for example, correspondingly stable connections can be provided. In particular, unless the pipes are out as cavities or recesses in the, for example, otherwise solid, rigid body out, they can be formed, for example, as corrugated pipes or Ge webeschläuche.

Due to the hydraulic connection of the electrolytic cell stack by means of the connecting element and in particular by the pressure-bearing or pressure-stable design of the hydraulic inter mediate interfaces and pipelines, the Ver is connection element advantageous for use in or as part of a pressure electrolysis device. In the pressure electro lysis, the water is pumped by a pump under pressure through the water circuits, so it takes place a forced circulation. As a result, more electrolytic cells can be operated hydraulically connected in series than in self-loading electrolysis.

In an advantageous embodiment of the present invention, the mechanical connection interfaces as flanges one, some or all of the hydraulic interfaces, so the inlets and / or the processes for making a mechanical connection of an external component - example, an electrolytic cell stack or another Ver connecting element - with formed the connecting element.

In other words, they are appropriately trained

Interfaces thus combined mechanical-hydraulic

Interfaces. For example, in each case the flange can surround or form an end piece of the respective pipeline ending or beginning at the hydraulic interface. Thus, both the mechanical cal and the hydraulic connection of the respective electrolytic cell stack with the connecting element can be realized with very little effort. The fact that the respective mechanical connec tion is ordered directly to the hydraulic interface, so takes place, can also advantageously without additional effort a particularly high density and / or pressure stability of the respective hydraulic connection, it will be enough.

In an advantageous embodiment of the present invention is in or at one, several or all of the inlets and outlets and / or adjoining pipes of the connec tion elements at least one adjustable component, in particular an orifice and / or a throttle and / or a valve, for adjusting a respective flow of water - that is, a flow and / or a mass or volume flow through-flowing water - arranged. Due to the adjustable component or the adjustable components can be adjusted as required by the respec GE by the hydraulic interface or pipeline water flow.

Likewise, this can advantageously be realized a pressure regulation in the hydraulic system. The use or arrangement of a plurality of such adjustable components may also advantageously allow separate parts or sections of the hydraulic system to dry separately, which may facilitate maintenance or repair work for example. Likewise, by an appropriate setting, STEU tion or regulation of the adjustable components particularly before a joint operation of different electrolytic cell stacks are made possible on the connecting element. This can be useful, for example, if the different electrolytic cell stacks have different requirements for a particular water flow or flow and / or have, for example, different gas production capacities.

In an advantageous embodiment of the present invention, the connecting element in addition to a, in particular with only one, the water circuits connected by a pipe openable and closable intermediate drain and intermediate inlet. This is the connection element through-flowing water - as needed - be branched be fed or fed. In particular, a adjustable part or portion of the water flowing through the connecting element be branched off or be supplied, so branched off and / or fed, this proportion by means of at least one arranged in or on the intermediate flow and / or the intermediate inlet, adjustable Ven tils is adjustable. In other words, therefore, an adjustable part of the connec tion element or the respective water cycle flowing through water flow, ie the corresponding Mas sen- or volume flow, for example, an external hyd raulischen system or an external device supplied or passed through an external device, in particular after this part or portion of the water has passed through one of the connected electrolytic cell stacks but before it flows or passes into the other connected electrolysis cell stack. This advantageously allows one, for example, thermal and / or chemical, conditioning or adaptation of the water - or generally ver used electrolysis fluid, in particular between the flow through the two electrolytic cell stack. This in turn allows an improved or optimized Elektrolysebe operation of both connected electrolysis cell stack, as in each case optimally conditioned water can be supplied.

For example, overheating of the electrolysis cell stacks or of the electrolysis cells can be avoided in a particularly efficient manner since the heated water can efficiently remove process heat from the electrolysis cell stack via the intermediate drain. Likewise, for example, heated water can be supplied via the intermediate inlet in order to ensure efficient electrolysis operation. Beispielswei se can be ensured so that the intermediate inlet hydraulically downstream electrolytic cell stack zuflie sequent water at least a predetermined minimum temperature, for example at least 40 ° C, since below this temperature, the electrolysis significantly less efficient ablau fen can. So can advantageously also a faster start the electrolysis process or the electrolysis device and / or a faster achievement of maximum efficiency from a previous shutdown operating state out are made possible.

Advantageously, a controller or a regulating device can be arranged on or in the connecting element, in particular be part of the connecting element. By means of this control or regulating device, for example, the adjustable valve and / or at least one other adjustable component can be actuated automatically, that is, adjusted or adjusted. This automatic activation can be effected, for example, as a function of a measured temperature of the water flowing through the connecting element, as a function of an internal or water pressure present in the hydraulic system and / or depending on a measured gas production of the connected electrolysis cell stacks. For this purpose, corresponding sensors may be provided, which may be part of the connecting element or part of a ent speaking electrolysis device in example.

In an advantageous embodiment of the present invention, the connecting element has a heating and cooling device for controlling the temperature of water flowing through the connecting element. The heating and cooling device may in particular comprise an electric heating element and / or a radiator, preferably actively ventilated. Such a heating and Kühlein direction can advantageously a particularly fast, since immedi applicable to take place in or on the connection element itself temperature control of the water. The heating and Kühlein direction may be alternatively or in addition to a Temperie tion or conditioning of abge over the intermediate abge and / or supplied via the intermediate inlet water, so operated.

In an advantageous embodiment of the present invention, the connecting element has an electrical switching element for reversibly interrupting the electrical connection of electrical connections with each other. In other words, therefore, an electrical switching element is provided, by means of which when connected to the connecting element EleK rolysezellenstapeln the electrical connection of the electrolyte sezellenstapel can be interrupted. As a result, before geous even if both sets of electrolytic cells are connected to the connecting element, as needed, for example, only one of the two electrolysis cell pel electrically operated, so are actually used for electrolysis. This can be independent of the hydraulic system, that is independent of a water flow or water flow. By the need-based opening and closing of the electrical switching element can be advantageously achieved FITS efficient operation of the electrolysis device, since, for example, an optimal voltage adjustment can be made with minimal effort. For example, operation of a single electrolytic cell stack under full load can be more efficient than a partial operation, simultaneous operation of both electrolytic cell stacks. By thus enabling a partial load operation can advantageously be slowed aging of the electrolysis cell stack.

In an advantageous embodiment of the present invention, the connecting element has a, in particular adjustable or controllable, voltage source and / or voltage sink, which is electrically connected to the electrical terminals or by means of a respective upstream electrical rule switch is or are. The voltage source and / or - for example, depending on the polarity - voltage sink can advantageously allow a particularly accurate Anpas solution of a voltage level to an external electrical versor supply, for example, to improve the efficiency of the Elek rolysevorrichtung.

The electrolysis device according to the invention comprises a inven tion according to connecting element and two with this electrically and mechanically connected electrolysis cell stack on.

In addition, the invention Elektrolysevorrich device further components or devices have, for example, a water reservoir, a device for tempering Tieren and / or conditioning of ver used for the electrolysis, a pump for pumping the water through the electrolyzer, so to drive the water flow or a water circulation, a gas collecting device for collecting the gas produced by the electrolysis cell stacks and / or the like.

In a further development of the device according to the invention Elektrolysevor has these two other invention connec tion elements, which are arranged on the electrolysis cell stack connecting the central connecting element facing away from the ends of the electrolysis cell stack. Because of this remote or outboard location or position, the two other connectors are referred to herein as distal connectors.

The distal connection elements can be configured identically to the central connection element. This can, for example, a series connection of further Elektrolysezel lenstapel or electrolysis in allow in accordance with the Invention electrolysis device.

Likewise, however, the distal connection elements can be designed differently from the central connection element. For example, the central connection element can be completely penetrated by pipelines in order to hydraulically connect the electrolytic cell stacks with one another. In contrast, the distal connection elements may be formed, for example, as end elements or end caps and the water circuits of the electrolysis cell stack outward Shen, that is, in a direction away from the central connecting element along the stacking direction, lock or lock, so limit. The distal connec tion elements can then, for example, one of the cent ral connecting element outgoing and the respective

Electrolysis cell stack up to the respective distal Ver binding element by flowing water flow or water flow deflect, so that it flows through the respective electrolysis cell pel pel in the reverse direction again up to the central connection element or flows through. This can advantageously enable a particularly simple and central hydraulic contacting of the electrolysis device to the central connecting element.

Regardless of the other embodiment, the inventive connecting element and the electrolysis device according to the invention for the PEM electrolysis (English "proton exchange membrane" or "polymer electrolytes membrane") can be used, so be trained.

The properties and refinements of the connection element according to the invention and the corresponding advantages given heretofore and below are mutatis mutandis applicable to the electrolysis device according to the invention and vice versa. It therefore belong to the invention, such Wei developments of the connecting element according to the invention and the electrolysis device according to the invention, which have events that are not explicitly described here in the respec conditions combination.

Other features, objects and advantages of the present invention will become apparent from the following description be preferred embodiments and with reference to the drawings. Showing:

1 shows a schematic side view of two electrolysis cell stacks, which are connected by a connecting element electrically and mechanically interconnected and hydraulically separated from each other; and 2 shows a schematic and partial side view of an alternative variant of a Verbindungsele management, which two electrolytic cell stacks

electrically, mechanically and hydraulically interconnects.

In the embodiments explained below it is han preferred embodiments of the invention. In the embodiments, the Kom described components of the embodiments each individually, independently of each other to be considered features of the invention, wel che the invention each also independently form further and thus individually or in any other than the combination shown to be considered part of the invention , Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

In the FIG same, functionally identical or mutually ent speaking elements are each identified by the same reference numerals.

1 shows a schematic and partial side view of an electrolysis device 1, which has a central to parent connection element 2 and two with this verbun dense electrolytic cell stack 3. The latter are a first electrolytic cell stack 4 and a second electrolysis cell stack 5, which are connected on opposite sides of the connecting element 2 to this. The electrolysis cell stacks 3 each have a plurality of individual electrolysis cells 6, which are arranged in or along the respective stacking direction or stacking axis of the electrolysis cell stacks 3 at least substantially parallel to each other. By way of example, only a few electrolysis cells 6 are shown here, but the electrolytic cell stacks 3 can have a multiplicity of further electrolysis cells 6. Furthermore shown schematically or indicated here are a first distal connecting element 7 and a second distal connection element 8. The distal connection elements 7, 8 are arranged on opposite sides, away from the central connection element 2, of the electrolytic cell stacks 3. The distal Verbindungsele elements 7, 8 may each be additional, separate components or they may be part of the electrolysis device 1.

The connecting element 2 has a rigid basic body 9, in which further components of the connecting element 2 are embedded. The base body 9 may, depending on requirements, for example, be formed of a metallic or ceramic material or a plastic or a combination thereof. In the present case, the connecting element 2 has two electrical interfaces or electrical connections 10 for electrically connecting or contacting the two electrolysis cell stacks 3. The electrical connections 10 are presently arranged on those sides of the connecting element 2, with which the electrolysis cell stack 3 are connected ver. This is a preferred, but not the only possible arrangement. In particular, in an order of the electrical connections 10 on another side of the connecting element 2, the respective electrical connection Ver with the electrolytic cell stacks 3, for example by means of a correspondingly guided electrical line can be made. The electrical connections 10 are connected to one another by means of a connecting element 2 sweeping rule electrical line, so that here also the two electrolytic cell stack 3 electrically connected to each other ver, in particular in series, are.

In the present case, the connecting element 2 on this rule electrical an electrical switching element 11, by means of which the electrical connection of the two electrical connections 10 and thus the two electrolytic cell stack 3 can be reversibly interrupted if necessary or Herge provides. In this case, for example, an electrical connection of one of the two electrolytic cell stacks 3 to an electrical alternative connection 12 of the connection can be made. elements 2 are produced. This can advantageously egg nen individual operation of the connected Elektrolysezel lenstapel 3 allow. The alternative electric connection 12 may be connected to, for example, an external electric energy supply.

In the present example, the connecting element 2 to additionally connected to the electrical line, an adjustable or controllable electrical voltage source 13, by means of which a voltage level can be influenced. Here, for example, a voltage and / or power adjustment based on the external electrical Energieversor supply, by means of which the electrolytic cell stack 3 are operated, can be realized.

In addition to the electrical connection of the two Elektrolysezel lenstapel 3, the connecting element 2 is used for mechanical and hydraulic bonding or contacting the two

Electrolysis Cell Stack 3. In the presently disclosed embodiment, the electrolytic cell stacks 3 and the connecting element 2 are mechanically coupled together to form the electrolysis device 1. Hydraulic are both the first. Electrolysis cell stack 4 and the second electro lysezellenstapel 5 here in each case with the Verbindungsele element 2, that is connected to a hydraulic system of the connecting element 2, but not with each other. In other words, the connecting element 2 separates the two electro lysezellenstapel 3 hydraulically from each other, thus forming a hydraulic separator between the two electrolysis cell stacks. 3

The hydraulic system of the connecting element 2 comprises hydraulic interfaces 14, of which the Verbindungsele element 2 here has several. Further, the hydraulic system of the connecting element 2 comprises pipes 15 which each Weil two of the hydraulic interfaces 14 connect with each other. In the present composite, that is, when connected to the Ver connecting element 2 electrolytic cell stacks 3, The respective hydraulic connections of the connec tion element 2 with the first electrolytic cell stack 4 egg nerseits and with the second electrolytic cell stack 5 walls on the other hand by means of respective respective Hydraulikikanschlüs se 16 of the electrolytic cell stack 3 produced. For this purpose, the hydraulic connections 16 with the corresponding, arranged on the respective side of the connecting element 2 hy metallic interfaces 14 of the connecting element 2 verbun the. In this case, some or all of the hydraulic cut points 14 and the hydraulic connections 16 may have flanges or be formed as flanges, to make the me chanical connection of the electrolytic cell stack 3 with the connecting element 2 easy and space saving at the same time.

Not for hydraulic connection with one of the electrolysis cell stack 3, ie with one of the hydraulic connections 16, provided hydraulic interfaces 14 may be example, external connections 17. These external connections 17 can be used for hydraulic connection of the connecting element 2, more precisely its hydraulic system, with an external water line or water supply, ie with an external hydraulic system.

Depending on the given in a specific application flow direction of the hydraulic system of the connecting element 2 and accordingly the electrolytic cell stack 3 durchflie ßendem water may be at the individual hydraulic interfaces 14 and the individual hydraulic connections 16 each have an inlet or a drain. For example, a possible flow Rich direction is indicated by arrows 18 here. Accordingly, the amount of hydraulic interfaces 14 for the first electrolysis cell stack 4 comprises a first inlet 19, a first outlet 20, a second inlet 21 and a second outlet 22. The first inlet 19 and the first outlet 20 may be part of a first , Water cycle while the second inlet 21 and the second outlet 22 are part of one of them separate or dependent second water cycle. Accordingly, in the case of the electrolysis cell stacks 3, it is possible to flow through each of two independent water circuits, one of which can be used, for example, to obtain hydrogen gas and the other to obtain oxygen.

The measures provided for the hydraulic connection of the connecting element 2 with the electrolytic cell stacks 3 of the hydraulic inter mediate interfaces 14 may be arranged, for example, each in egg ner pocket or recess 23. In this way, space can be provided to achieve a flush connection between tween the connecting element 2 and the electrolysis cell stacks 3 and / or to provide, for example, room for movement of a movable suspension and / or a flexible portion of the respective duct 15 and / or order an assembly of the electrolysis device 1 to facilitate it.

Depending on the specific design or specific requirements, the hydraulic system of the connecting element 2 may have further components. By way of example, another set 24 of hydraulic interfaces and corresponding pipelines, ie hydraulic connections, is indicated here. Such other hydraulic components, for example, a complex water channels, such as example a return path through the respective electro lysezellenstapel 3 in separate water circuits ermögli surfaces. For this purpose, the further hydraulic components 24 may comprise or be, for example, further inlets, outlets, external connections and the like.

In the embodiment shown here, the connec tion element 2 a total of at least eight hydraulic

Interfaces 14 on. Likewise, however, for example, along a central transverse plane 25 indicated here, a dividing line may extend along which two connecting elements connected to each other, each of which then example, only four hydraulic interfaces 14 - if given supplements to the respective other hydraulic compo nents 24 - has. Such a design of a connec tion elements is here indicated in the form of the second distal connec tion elements 8. Like the connecting element 2, the second distal connecting element 8 has electrical and hydraulic interfaces and can also just if not shown optional components, accordingly, for example, the switching element 11, the Alternativan circuit 12, the voltage source 13 and / or the other hyd raulischen Components 24, have. Unlike the connec tion element 2, the second distal connection element 8 on its side facing away from the second electrolytic cell stack 5 side exemplified here mechanical Schnittstel len 26, which provided for mechanically connecting the second dista len connecting element 8 with another, not shown here, connecting element and are formed.

The mechanical interfaces 26 can be combined with an electrical interface, for example, in order to enable an electrical connection between the second distal connecting element 8 and the wide connecting element, not shown here. In the Darge presented here arrangement, for example, the se for the electrolytes used in the second electrolysis cell stack water in a first stream of water from an external source or water supply via a hydraulic interface 27 in the connecting element 2 and from there via the adjoining pipe 15 in the second electrolytic cells stack 5 arrive. This can then pass through the water in a ers th water cycle to the second distal connection element 8, from which it can be led out via a hydraulic interface 28. In a second, independent water cycle of the second electrolysis cell stack 5, for example, a corresponding two ter water flow through a hydraulic interface 29 of an external source or supply into the second distal connection element 8 and further into the second electrolysis cell stack 5 arrive. This is then flowed through in the second What serkreislauf up to the connecting element 2, which can leave the second water flow, for example via a hyd raulische interface 30 again. In this arrangement, the second distal connecting element 8 may thus be formed as an end element or end cap of the second electrolytic cell stack 5.

In the first distal connecting element 7, an alternative configuration of the hydraulic system is interpreted as an example. In this possible configuration, for example, a first water flow for the first electrolysis cell stack 4 flow from an external water supply into the first inlet 19 and further via the first outlet 20 into the first electrolytic cell stack 4. This first water flow can then flow through to a hydraulic interface 31 at which the first electrolytic cell stack 4 is hydraulically connected to the first distal connecting element 7. This first water flow can then flow through a deflection pipe 32 adjoining the hydraulic interface 31 through the first distal connection element 7 as far as a further hydraulic interface 33, where it can again enter the first electrolytic cell stack in order to enter it reverse direction back to the connecting element 2 to flow through. In this case, however, the first water flow enters via the second inlet 21 in the connec tion element 2, this then over the second. Exit process 22. Analogously and in parallel, for example, a second water flow in an independent second water circuit from an external source through a hinted here tet shown hydraulic interface 34 in the connec tion element 2 get and this flow through to another at interpreted hydraulic interface 35, where the second water flow then in the first electrolysis stack 4 can pass. Regardless of the first stream of water, this second stream of water can Stack 4 then from the other hydraulic interface 35 through to a hydraulic interface 36, where it can enter into the hydraulic system of the first distal connec tion element 7. The latter, this second water stream, after he has durchflos sen via a corresponding connecting pipe, the first distal connecting element 7 sen, leave at a hydraulic interface 37 by renewed tes trespassing in the first electrolysis cell stack 4 again. Furthermore, following the independent second water cycle of the first electrolysis cell stack 4, this second water flow can leave the first electrolytic cell stack 4 up to a further indicated hydraulic interface 38 by renewed crossing into the connecting element 2. From the connecting element 2, the second water flow can then exit, for example, via a here also indicated is asked further hydraulic interface 39.

2 shows a schematic and partial side view of a second electrolysis device 40, in which a connecting element 41 in an alternative embodiment also two electrolytic cell stacks 3 with each other connec det. The connecting element 41 may be formed in electrical and mechanical terms as well as or similar to the connec tion element 2. The connecting element 41 therefore also has electrically connected electrical connections 10 for electrically connecting the two electrolytic cell stacks 3 connected to the connecting element 41. Likewise, the connecting element 41 in example, the switching element 11, the alternative terminal 12 and / or the voltage source 13 corresponding components or components - even if they are not all explicitly shown here.

Also, the connecting element 41 has a plurality of hydraulic interfaces 14, which are hydraulically connected in pairs with pipes 15. In addition, the connecting element 41 can also be further hydraulic grain components 24, such as, for example, further feeds, drains and pipelines or the like.

The connecting element 41 thus serves as well as the connec tion element 2 for electrically and mechanically coupling two electrolytic cell stack 3. Unlike the connection element 2, the connecting element 41, however, no hyd raulische separation between the connected electrolysis cell stacks 3, but also connects them hydraulically with each other. In this case, a first water cycle of one of the electrolysis cell stack 3 with a first water cycle of the other of the electrolytic cell stack 3 via a Rohrlei device 15 of the connecting element 41 and corresponding hy lic interfaces 14 may be hydraulically connected. Corresponding chendes can apply for respective second water circuits of the two electrolytic cell stack 3.

Using the example of the second electrolysis device 40, some further possible components or configurations are now to be explained, which can be applied analogously to the connecting element 2 and the distal connecting elements 7, 8, that is to say can be transferred to them.

In the present case, the connecting element 41 has a heating and cooling device 42. The heating and cooling device 42 is used for controlled or regulated, in particular active, tempering of the connecting element 41 by flowing water. For this purpose, the heating and cooling device 42 preferably on a pipe 15, which is flowed through by the water to be tempered or can be flowed through, be arranged, for example, the corresponding pipe 15 umge ben. The heating and cooling device 42 may for heating the water, for example, an electric heater and cooling off the water a heat sink or radiator 43 aufwei sen. In order to enable efficient cooling, the radiator 43 may be coupled, for example thermally conductively, to the base body 9 of the connecting element 41 and / or the connecting element 41 may penetrate to the outside thereof, that the radiator 43 then deliver heat absorbed from the water directly to an environment of the connecting element 41, for example, can radiate. The connecting element 41 may differently than shown here also have several corresponding heating and cooling device 42, for example, a separate heating and cooling device 42 may be arranged on each pipe 15, which advantageously a particularly accurate ge, individually adapted temperature for unterschiedli che sections of the hydraulic Systems of Elektrolysevor device 40 is made possible.

Furthermore, the connecting element 41 in the present case on one of the pipes 15 an intermediate drain 44 and an intermediate inlet 45, which connect the corresponding pipe 15, so the hydraulic system of the connecting element 41, presently hy with an external hydraulic system 46. About the intermediate flow 46 while water can be diverted from the pipe 15, that is led out of the connection element 41, in particular directly, so without first one of the electrolytic cell stack 3 to flow through. Accordingly, from the external hydraulic system 46 via the intermediate inlet 45 also directly water introduced into the pipe 15, so the hydraulic system of the connecting element 41 are supplied.

In order to regulate a proportion of the so branched off and / or supplied What sers, are present in the interim run 44 and the intermediate inlet 45 adjustable valves 47 arranged.

The external hydraulic system 46 may, for example, have a conditioning device 48 for conditioning the abge branched and / or the water to be supplied. By means of the conditioning device 48, for example, the water tempered, chemically treated and / or purified. Likewise, for example via the intermediate drain 44 and the corresponding valve 47, water for measurement or control purposes can be withdrawn from the hydraulic system of the second electric motor. lysis device 40 are removed. Furthermore, the intermediate flow 44 and / or the intermediate inlet 45 can be used for Druckre regulation in the hydraulic system of the connecting element 41 or the second electrolyzer 40 a total of ver. Unlike shown here, the connec tion element 41 may have more than one intermediate flow 44 and / or more than an intermediate inlet 45, for example, on one, several or all other pipes 15 and / or hydraulic interfaces 14. Also, the connecting element 2 and the distal connecting elements. 7 , 8 may derarti ge inter-drains 44 and / or intermediate inlets 45 and / or corresponding valves 47 have. Likewise, all Ver binding elements 2, 7, 8, 41 elsewhere or at other ren points of the respective hydraulic system components or components, in particular adjustable components, such as Blen, chokes and / or valves, for regulating a respec conditions water flow, ie a respective mass or volume flow and / or a flow or flow rate, have.

Claims

claims

1. connecting element (2, 7, 8, 41) for the electrical and me chanical connecting two electrolytic cell stacks (3, 4,

5), wherein the connecting element (2, 7, 8, 41)

- Has a rigid base body (9), the rule to connect at least one of the electrolytic cells stack (3, 4, 5) a first inlet (14, 19, 31) and a first outlet (14, 20, 33) for a first Water circuit and for a independent of this second water cycle run a second inlet (14, 21, 36) and a second outlet (14, 22, 37),

- electrically conductively interconnected electrical connections to (10) for electrical connection of the two EleK rolysezellenstapel (3, 4, 5), wherein the connec tion element (2, 7, 8, 41) at the electrical connections to (10) connected Electrolysis cell stacks (3, 4, 5) an electrical connection of the two electrolysis cell stacks (3, 4, 5) in a common circuit bil det, and

- Mechanical connection interfaces for mechanical Ver bind the electrolytic cell stack (3, 4, 5) with the Ver connecting element (2, 7, 8, 41), wherein the mechanical's connection interfaces on gegenüberlie ing sides of the connecting element (2, 7, 8, 41) are arranged, so that at the connection interfaces mechanically connected electrolytic cell stacks (3, 4, 5) extend their stacking axes parallel to each other.

Second connecting element (2, 7, 8, 41) according to claim 1, characterized in that the connecting element (2, 7, 8, 41) for each water cycle at least one connected thereto by a pipe (15) hydraulic external connection (17). for connecting at least one external, of the

Electrolytic cell stacks (3, 4, 5) has different Wasserlei device.

3. Connecting element (7, 8) according to one of the preceding claims, characterized in that

- The connecting element (7, 8) as an end element for a ers th of the two electrolytic cell stacks (3, 4, 5) is ausgebil det,

- This electrolysis cell stack (3, 4, 5) associated electrical connections and mechanical connection interfaces for direct connection or connection of this electrolysis cell stack (3, 4, 5) are out forms and

the second of the two electrolytic cell stacks (3, 5,

4) associated electrical connections and mechanical connection interfaces for connecting or connecting to an end element of the second electrolysis cell stack (3, 5, 4) serving identical connection element (7, 8) are formed.

4. connecting element (7) according to claim 3, characterized marked characterized in that the inlets (31, 36) and drains (36, 37) of the first and the second water cycle the first electrolyte sezellenstapel (3, 4) are assigned, so that the connec (7) in this connected electrolysis cell lenstapeln (3, 4) only of water of the first Elektrolysezel lenstapels (4) can be flowed through and thereby forms a hy cal separation between the electrolytic cell stacks (3, 4).

5. connecting element (2, 7, 8, 41) according to one of claims 1 and 2, characterized in that

- The connecting element (2, 7, 8, 41) in addition a third th inlet (14, 24) and a third outlet (14, 24) for a third water circulation and a fourth inlet (14, 24) and a fourth outlet (14 , 24) for a fourth water cycle, wherein all four water cycles are independent of each other, and

- the feeds (14, 24) and drains (14, 24) for the first water cycle and for the second water cycle a first of the electrolytic cell stacks (3, 4, 5) and the Zuluu- Fe (14, 24) and processes (14, 24) for the third water circuit and for the fourth water cycle a second of the electrolytic cell stacks (3, 5, 4) are assigned, so that the connecting element (2, 7, 8, 41 ) can be simultaneously flowed through by water of both electrolytic cell stacks (3, 4, 5) in the case of electrolysis cell stacks (3, 4, 5) connected thereto and forms a hydraulic separation between the electrolysis cell stacks (3, 4, 5).

6. Connecting element (41) according to one of claims 1 to 3, characterized in that the connecting element (41) for each of the two water circuits pipes (15) has, which the respective inlet (14, 24) with the respective sequence (14 , 24) connect and, when the electrolyte is connected, the connecting element (41) through the inlets (14, 24), outlets (14, 24) and pipelines (15) to form a hydraulic connection between the two electrolytic cell stacks (3,

4, 5) forms.

7. connecting element (41) according to claim 6, characterized in that the inlets (14, 24), drains (14, 24) and pipes (15) are pressure-bearing, in particular re trained to an internal pressure of at least

35 bar to withstand.

8. connecting element (2, 7, 8, 41) according to one of vorherge existing claims, characterized in that the mechanical connection interfaces rule as a flanges on one, eini conditions or all of the inlets (14, 24) and / or processes (14, 24) for producing a mechanical connection of an external component (2, 4, 5, 7, 8) with the connecting element (2, 7, 8, 41) are formed.

9. connecting element (2, 7, 8, 41) according to one of vorherge existing claims, characterized in that in one, meh er or all of the inlets (14, 24) and processes (14, 24) and / or adjoining thereto Pipelines (15, 32) of the connecting element (2, 7, 8, 41) at least one adjustable Res component, in particular a diaphragm and / or a throttle and / or a valve, for adjusting a respective water flow is arranged.

10. Connecting element (2, 7, 8, 41) according to one of vorherge existing claims, characterized in that the connec tion element (2, 7, 8, 41) in addition at least in each case egg nen, with one of the water cycles through a pipe (15 ) connected via openable and closable intermediate drain (44) and intermediate inlet (45), what the connec tion element (2, 7, 8, 41) through-flowing water, in particular a means of at least one in or on the Zwischenab running (44) and / or the intermediate inlet (45) arranged an adjustable valve (47) adjustable proportion of the connec tion element flowing through water, can be branched off or supplied as needed.

11. connecting element (2, 7, 8, 41) according to one of vorherge existing claims, characterized in that the connec tion element (2, 7, 8, 41) a heating and cooling device (42) for controlling the temperature of the connecting element (2 , 7, 8, 41), in particular comprising an electric heating element and / or one, preferably actively ventilated, radiator (43).

12. connecting element (2, 7, 8, 41) according to one of vorherge existing claims, characterized in that the connec tion element (2, 7, 8, 41) an electrical switching element (11) for reversibly interrupting the electrical connection of the electrical connections (10).

13. Connecting element (2, 7, 8, 41) according to one of vorherge existing claims, characterized in that the connec tion element (2, 7, 8, 41) a, in particular adjustable, voltage source (13) and / or voltage sink (13 ), which is electrically connected to the electrical terminals (10) connected ver, for optimizing a voltage level when connected operated electrolysis cell stacks (3, 4, 5) with respect to a given criterion, in particular for a maximized electrolysis efficiency.

14. electrolysis device (1, 41), which che a connection element (2, 7, 8, 41) according to one of the preceding Ansprü and two with this connecting element (2, 7, 8, 41) electrolytically and mechanically connected electrolysis cell stack (3 , 4, 5).

15. electrolysis device (1, 41) according to claim 14, characterized in that the electrolysis device (1, 41) has two further, distal connecting elements (7, 8) according to one of the preceding claims, of which the electrolytic cell stack (3, 4th , 5) connecting connecting element (2, 7, 8, 41) facing away from the ends of the Elektrolysezel lenstapel (3, 4, 5) are arranged.